Note: Dolomite Lime acts as a natural pH buffer and will help keep the pH constant when added to your soil during the compost process. It can also help correct acidic soil up to a certain point. If you have just realized your soil pH is too low, try to find powdered dolomite lime, as the larger chunks take longer to break down, though be careful that you don't add more than instructed, lime is "hot" (has relatively high levels of nutrients) and can burn your plant in too-high doses. The larger chunks should be okay if you're just looking for a pH buffer.

Using an inorganic pH adjuster (like the pH Up and Down that come with most pH adjustment kits, for example the General Hydroponics pH kit) will actually damage your microherd (beneficial bacteria) and can set your plants back as far as nutrient breakdown / absorption is concerned.